Question about Watts Onan Portable Generator - 4000 , Model# 5500

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Onan 5500 I am having problems with my generator after it runs for about 30 min +, it runs fine at first, then the engine rpm's fluctuate up and down then shuts off. code 36 is the trouble code. I have replaced the fuel pump, fuel filter and spark plugs. air filter is fine. i removed the carb and checked the float(appears to be fine). I have not checked the jet or cleaned it. It seems as though it is a fuel issue. Is it possible to be starved of fuel after time? Could air develop in the line? Could it be "overheating"? Would these symptoms be from valves sticking? I have not checked the power output? I am only running 1 ac and fridge when this occurs. Any suggestions of what it may be or things to check? Any advise would be appreciated. Has anyone else experienced this before? Is it a common occurrence? Please help thank you

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Well they have an expensive card in there that controls rpm and voltage to maintain 120v. there is a safety for oil temp in some of those maybe bad try bypassing it after it heats up to pin point it. maybe time to clean brushes?

Posted on Apr 17, 2009

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